No organism is always the first step, except in a wide sense, plants. In the water, plankton is found in first but whereas on land, plants or seeds are eaten first.
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Answer:
A watershed is a region obtaining both land and water. This is a shallow land region which accumulates water from drainage obtain from different sources like lake, river and pond. A watershed may also develop in a forest ecosystem. The clear cutting of forest will result expose more amount of soil nutrients for erosion by water as compared to natural forest. Therefore, nutrient loss will be higher in clear- cut watershed than natural forest watershed.
What supports natural selection is that more organisms are born that survive: so that only the fittest would survive. The natural selection then selects the strongest individuals to surive and procreate.
